Looks like the plant is starting cannabalizing itself. Sent from my SM-G935V using Grasscity Forum mobile app
On what part of the plant are the affected leaves from? What medium are you using? Are you feeding her any nutes yet? If so, how much? Can you take a pic of the whole plant for better evaluation?
Can you take pics but in natural light. Those LED's aren't going to help me diagnose your leaves one bit.
Looks like nutrient burn to me. By week 8 flower you should already be either lowering your nute doses or discontinuing to feed her altogether.